Ghosts? Yes. I also believe in God, angels, and demons. I think angels, demons, and ghosts are all basically the same type of "creature". Some are kind, some are mean, and some are indifferent.
Garry and I lived in San Francisco for a while. Talk about freaky! I had an encounter with a particularly mean-spirited (no pun intended) and frightening ghost one night. It was horrible, compounded by lots of other "stuff" that was happening that night. That was 2 years ago and I'm just now to the point where I can talk about it without getting completely freaked out again. I'm starting to think that the rest of what happened that night was also caused by the ghost (or whatever it was).